Android获取软键盘的高度、键盘的打开与关闭、监听键盘处于打开还是关闭状态

    //一个静态变量存储高度
    public static int keyboardHeight = 0;
    boolean isVisiableForLast = false;
    ViewTreeObserver.OnGlobalLayoutListener onGlobalLayoutListener = null;

    public void addOnSoftKeyBoardVisibleListener() {
        if (keyboardHeight > 0) {
            return;
        }
        final View decorView = getWindow().getDecorView();
        onGlobalLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                Rect rect = new Rect();
                decorView.getWindowVisibleDisplayFrame(rect);
                //计算出可见屏幕的高度
                int displayHight = rect.bottom - rect.top;
                //获得屏幕整体的高度
                int hight = decorView.getHeight();
                boolean visible = (double) displayHight / hight < 0.8;
                int statusBarHeight = 0;
                try {
                    Class<?> c = Class.forName("com.android.internal.R$dimen");
                    Object obj = c.newInstance();
                    Field field = c.getField("status_bar_height");
                    int x = Integer.parseInt(field.get(obj).toString());
                    statusBarHeight = getApplicationContext().getResources().getDimensionPixelSize(x);
                } catch (Exception e) {
                    e.printStackTrace();
                }

                if (visible && visible != isVisiableForLast) {
                    //获得键盘高度
                    keyboardHeight = hight - displayHight - statusBarHeight;
                    Log.i("keyboardHeight==1213==", "" + keyboardHeight);

                }
                isVisiableForLast = visible;
            }
        };
        decorView.getViewTreeObserver().addOnGlobalLayoutListener(onGlobalLayoutListener);
    }

public class KeybordS {

    /**
     * 打开软键盘
     */
    public static void openKeybord(EditText mEditText, Context mContext) {
        mEditText.setFocusable(true);
        mEditText.setFocusableInTouchMode(true);
        mEditText.requestFocus();

        InputMethodManager imm = (InputMethodManager) mContext
                .getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(mEditText, InputMethodManager.RESULT_SHOWN);
        imm.toggleSoftInput(InputMethodManager.SHOW_FORCED,
                InputMethodManager.HIDE_IMPLICIT_ONLY);
    }

    /**
     * 关闭软键盘
     */
    public static void closeKeybord(EditText mEditText, Context mContext) {
        InputMethodManager imm = (InputMethodManager) mContext
                .getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(mEditText.getWindowToken(), 0);
    }

     /**
     * 关闭软键盘
     */
     public static void hideInput(Activity activity) {
        if (activity.getCurrentFocus() != null) {
            InputMethodManager inputManager = (InputMethodManager) activity.getSystemService(INPUT_METHOD_SERVICE);
            inputManager.hideSoftInputFromWindow(activity.getCurrentFocus().getWindowToken(), 0);
        }
    }

    /**
     * 判断当前软键盘是否打开
     */
    public static boolean isSoftInputShow(Activity activity) {

        // 虚拟键盘隐藏 判断view是否为空
        View view = activity.getWindow().peekDecorView();
        if (view != null) {
            // 隐藏虚拟键盘
            InputMethodManager inputmanger = (InputMethodManager) activity
                    .getSystemService(Activity.INPUT_METHOD_SERVICE);
//       inputmanger.hideSoftInputFromWindow(view.getWindowToken(),0);

            return inputmanger.isActive() && activity.getWindow().getCurrentFocus() != null;
        }
        return false;
    }

}

private void setListenerToRootView() {
    final View rootView = getWindow().getDecorView().findViewById(android.R.id.content);
    rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {

            boolean mKeyboardUp = isKeyboardShown(rootView);
            if (mKeyboardUp) {
                //键盘弹出
                //Toast.makeText(getApplicationContext(), "键盘弹出", Toast.LENGTH_SHORT).show(); 
            } else {
                //键盘收起
                //Toast.makeText(getApplicationContext(), "键盘收起", Toast.LENGTH_SHORT).show();
            }
        }
    });
}


private boolean isKeyboardShown(View rootView) {
    final int softKeyboardHeight = 100;
    Rect r = new Rect();
    rootView.getWindowVisibleDisplayFrame(r);
    DisplayMetrics dm = rootView.getResources().getDisplayMetrics();
    int heightDiff = rootView.getBottom() - r.bottom;
    return heightDiff > softKeyboardHeight * dm.density;
}